21227446 has 16 divisors (see below), whose sum is σ = 33721200. Its totient is φ = 9993888.

The previous prime is 21227419. The next prime is 21227447. The reversal of 21227446 is 64472212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21227447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4960 + ... + 8188.

It is an arithmetic number, because the mean of its divisors is an integer number (2107575).

Almost surely, 2^21227446 is an apocalyptic number.

21227446 is a deficient number, since it is larger than the sum of its proper divisors (12493754).

21227446 is a wasteful number, since it uses less digits than its factorization.

21227446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3423.

The product of its digits is 5376, while the sum is 28.

The square root of 21227446 is about 4607.3252544182. The cubic root of 21227446 is about 276.8848848525.

Adding to 21227446 its reverse (64472212), we get a palindrome (85699658).

The spelling of 21227446 in words is "twenty-one million, two hundred twenty-seven thousand, four hundred forty-six".